TECHNIQUE FOR REMOTE RECONNAISSANCE DIAGNOSTICS OF PROVIDING PLANTS WITH NITROGEN (USING A MULTISPECTRAL CAMERA AND UNMANNED AERIAL VEHICLES) Russian patent published in 2019 - IPC A01G7/00 G06K9/52 A01C21/00 

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture, in particular to methods for reconnaissance diagnostics of plants state using unmanned aerial vehicles (UAV) to obtain photometric data. In the method, a reference area is formed next to the diagnosed field, wherein the platform has a homogeneous surface and is marked with markers. Control areas marked with markers are formed in the area of the diagnosed area. Reference sites have different degree of plant density. Method includes aerial survey of plant growth zone by means of UAV equipped with multichannel chamber, UAV overlap shooting area is equal to 60 %. Using UAV, multispectral images of the field are obtained with reference to geographical coordinates of the survey areas. Plant ground measurement is carried out using an N-tester on the above control field sites to obtain data on nitrogen content in plant leaves. Ground-based measurement of spectral brightness of point objects on a reference area and values of spectral brightness of the calibration panel is carried out using a spectroradiometer. Determining the terrestrial coefficients of spectral brightness (CSB) by dividing the measurement results of the sections on the reference site with a spectroradiometer to the result of measuring the calibration panel by itself with bringing the result to range of 0–1 (0–100 %). Data of aerial photography and ground measurements are transmitted to a computing device and processed, during which a multispectral orthophotomap of the diagnosed field is formed from aerial survey data. Calculating atmospheric correction values for each pixel of orthophotomap by regressing initial values of brightness of pixels obtained directly during aerial photography, to CSB obtained during ground measurements of reference sites included in the orthophotomap. Map of vegetation index NDVI or GNDVI displaying nitrogen content in plants of the diagnosed field is plotted. Calibration of the obtained maps is performed using data of ground measurement of reference sites.

EFFECT: method provides higher accuracy of plants status determination.

1 cl, 5 dwg, 1 tbl